5.21073504 (gal us)....
4.3467648 (gal UK)....
that doesn't help for in but im an auzzy and i don't need the answer...
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16foot
1 and 1/2 gallons
Taking 1 inch to be about 2.5cm, an inch of rain on an area of 1m2 is approximatley 0.025m3, or 25000cm3. That is 25000ml or 25l of water.
12" x 12" x 1"= 144 cubic inches, which is equal to .623 gallons therefore a one thousand square foot roof receiving one inch of rain will catch 623 gallons.
The volume increases to 9 times as much.